Efeitos de frustração geométrica em antiferromagnetos desordenados com clusters
Ano de defesa: | 2019 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , , , |
Tipo de documento: | Tese |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
Centro de Ciências Naturais e Exatas |
Programa de Pós-Graduação: |
Programa de Pós-Graduação em Física
|
Departamento: |
Física
|
País: |
Brasil
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/16501 |
Resumo: | In magnetic systems, frustration - which refers to the inhability to satisfy all the interactios simultaneously - has ravealed a rich phenomenology. In particular, disorder and geometrical features are possible sources of frustration. Systems that combine these two sources generally give rise to a number of challenging problems. In the present work, we approach the interplay between geometrical frustration (GF) and bond disorder, focusing in the rich phenomenology underlying the cluster spin glass (CSG) phase stabilization. In order to deal with this problem we considered the van Hemmen and the Sherrington-Kirkpatrick cluster models, as well as cluster mean-field methods. Our studies focused on the J1-J2 square, the antiferromagnetic kagome and the checkerboard Ising lattices with intercluster disorder. In the square and kagome lattices, we studied the CSG onset at low levels of disorder in geometrically frustrated systems, which is a problem with great experimental motivation. Our results indicate that the increase in frustration (by tuning J2=J1) reduces the minimum amount of disorder needed to stabilize the CSG in the square lattice. Moreover, for the kagome lattice, we found that an infinitesimal disorder leads to a CSG ground-state. This result can be compared to the experimental findings for the Co3Mg(OH)6Cl2 compound, that is pointed out as an experimental realization of the Ising kagome antiferromagnet. Moreover, we investigate the effects of GF on the onset of reentrant transitions. In this study, we considered a model with disorder between clusters in the presence of an external longitudinal magnetic field. Our results indicate that cluster magnets are prototypes for the observation of inverse freezing. Besides, at weak disorders, we observed the onset of field-induced CSG phases, indicating that cluster antiferromagnets are also candidates for field-induced glassy phases. |
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2019-05-09T14:44:34Z2019-05-09T14:44:34Z2019-01-11http://repositorio.ufsm.br/handle/1/16501In magnetic systems, frustration - which refers to the inhability to satisfy all the interactios simultaneously - has ravealed a rich phenomenology. In particular, disorder and geometrical features are possible sources of frustration. Systems that combine these two sources generally give rise to a number of challenging problems. In the present work, we approach the interplay between geometrical frustration (GF) and bond disorder, focusing in the rich phenomenology underlying the cluster spin glass (CSG) phase stabilization. In order to deal with this problem we considered the van Hemmen and the Sherrington-Kirkpatrick cluster models, as well as cluster mean-field methods. Our studies focused on the J1-J2 square, the antiferromagnetic kagome and the checkerboard Ising lattices with intercluster disorder. In the square and kagome lattices, we studied the CSG onset at low levels of disorder in geometrically frustrated systems, which is a problem with great experimental motivation. Our results indicate that the increase in frustration (by tuning J2=J1) reduces the minimum amount of disorder needed to stabilize the CSG in the square lattice. Moreover, for the kagome lattice, we found that an infinitesimal disorder leads to a CSG ground-state. This result can be compared to the experimental findings for the Co3Mg(OH)6Cl2 compound, that is pointed out as an experimental realization of the Ising kagome antiferromagnet. Moreover, we investigate the effects of GF on the onset of reentrant transitions. In this study, we considered a model with disorder between clusters in the presence of an external longitudinal magnetic field. Our results indicate that cluster magnets are prototypes for the observation of inverse freezing. Besides, at weak disorders, we observed the onset of field-induced CSG phases, indicating that cluster antiferromagnets are also candidates for field-induced glassy phases.Em sistemas magnéticos, a frustração - associada à incapacidade de satisfazer todas as interações simultaneamente - tem revelado uma grande riqueza fenomenológica. Em particular, desordem e características geométricas são possíveis fontes de frustração. Sistemas que coadunam estas duas fontes geralmente dão origem a uma série de problemas desafiadores. No presente trabalho, abordamos a relação entre frustração geométrica (FG) e interações desordenadas, focando na rica fenomenologia subjacente ao aparecimento da fase vidro de spin com clusters (VSC). Dentre as técnicas consideradas estão as abordagens com clusters dos modelos de van Hemmen e de Sherrington-Kirkpatrick, bem como teorias de campo médio com clusters. Através desses métodos, investigamos modelos de spins de Ising nas redes quadrada J1-J2, kagome e checkerboard na presença de desordem intercluster. No estudo das redes quadrada e kagome, focamos no aparecimento da fase VSC em baixos níveis de desordem em sistemas frustrados, problema este com grande motivação experimental. Nossos resultados para a rede quadrada indicam que o aumento da frustração (através do ajuste da relação J2=J1) reduz a desordem mínima necessária para a estabilização da fase VSC na rede quadrada. Um resultado particularmente interessante ocorre na rede kagome, na qual uma desordem infinitesimal leva a um estado fundamental VSC. Esses resultados podem ser comparados às observações experimentais para o composto Co3Mg(OH)6Cl2, que é apontado como uma realização da rede kagome de Ising antiferromagnética. Além disso, investigamos os efeitos de FG no aparecimento de reentrâncias considerando modelos com desordem entre clusters antiferromagnéticos e a presença de campo magnético externo longitudinal. Nossos resultados indicam que magnetos com clusters são protótipos para a observação de congelamento inverso. Além disso, para níveis baixos de desordem, observamos o aparecimento da fase VSC induzida por campo externo, indicando que antiferromagnetos com clusters também são candidatos para a observação de fases vítreas induzidas por campo externo.Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqporUniversidade Federal de Santa MariaCentro de Ciências Naturais e ExatasPrograma de Pós-Graduação em FísicaUFSMBrasilFísicaAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessClustersAntiferromagnetosDesordemFrustraçãoVidro de SpinAntiferromagnetsDisorderFrustrationSpin GlassCNPQ::CIENCIAS EXATAS E DA TERRA::FISICAEfeitos de frustração geométrica em antiferromagnetos desordenados com clustersEffects of geometrical frustration on disordered antiferromagnets with clustersinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisZimmer, Fábio Mallmannhttp://lattes.cnpq.br/6328420212181284Mombach, Jose Carlos Merinohttp://lattes.cnpq.br/7661373078999069Baierle, Rogério Joséhttp://lattes.cnpq.br/7565203547830128Tumelero, Milton Andrehttp://lattes.cnpq.br/0041450594172893Gusmão, Miguel Angelo Cavalheirohttp://lattes.cnpq.br/4913722698091490http://lattes.cnpq.br/7494768123165528Schmidt, Mateus100500000006600e33a6993-09ff-40de-b1e8-1a3a0fd077d27d3f72bd-203f-49b2-acd5-a483202e1605e02b7066-ca5e-408f-be88-7c502b57996a669a6707-ad7d-41fd-9fd8-f6d5bc15f7f324eaa072-96cb-47d7-a0c9-d993b7e65eb880a71339-78c0-4480-9a56-9a27399cd61ereponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALTES_PPGFISICA_2019_SCHMIDT_MATEUS.pdfTES_PPGFISICA_2019_SCHMIDT_MATEUS.pdfTese de Doutoradoapplication/pdf6485042http://repositorio.ufsm.br/bitstream/1/16501/1/TES_PPGFISICA_2019_SCHMIDT_MATEUS.pdffc298f7d42926a956b92f8ae15213b1aMD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; 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dc.title.por.fl_str_mv |
Efeitos de frustração geométrica em antiferromagnetos desordenados com clusters |
dc.title.alternative.eng.fl_str_mv |
Effects of geometrical frustration on disordered antiferromagnets with clusters |
title |
Efeitos de frustração geométrica em antiferromagnetos desordenados com clusters |
spellingShingle |
Efeitos de frustração geométrica em antiferromagnetos desordenados com clusters Schmidt, Mateus Clusters Antiferromagnetos Desordem Frustração Vidro de Spin Antiferromagnets Disorder Frustration Spin Glass CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Efeitos de frustração geométrica em antiferromagnetos desordenados com clusters |
title_full |
Efeitos de frustração geométrica em antiferromagnetos desordenados com clusters |
title_fullStr |
Efeitos de frustração geométrica em antiferromagnetos desordenados com clusters |
title_full_unstemmed |
Efeitos de frustração geométrica em antiferromagnetos desordenados com clusters |
title_sort |
Efeitos de frustração geométrica em antiferromagnetos desordenados com clusters |
author |
Schmidt, Mateus |
author_facet |
Schmidt, Mateus |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Zimmer, Fábio Mallmann |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/6328420212181284 |
dc.contributor.referee1.fl_str_mv |
Mombach, Jose Carlos Merino |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/7661373078999069 |
dc.contributor.referee2.fl_str_mv |
Baierle, Rogério José |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/7565203547830128 |
dc.contributor.referee3.fl_str_mv |
Tumelero, Milton Andre |
dc.contributor.referee3Lattes.fl_str_mv |
http://lattes.cnpq.br/0041450594172893 |
dc.contributor.referee4.fl_str_mv |
Gusmão, Miguel Angelo Cavalheiro |
dc.contributor.referee4Lattes.fl_str_mv |
http://lattes.cnpq.br/4913722698091490 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/7494768123165528 |
dc.contributor.author.fl_str_mv |
Schmidt, Mateus |
contributor_str_mv |
Zimmer, Fábio Mallmann Mombach, Jose Carlos Merino Baierle, Rogério José Tumelero, Milton Andre Gusmão, Miguel Angelo Cavalheiro |
dc.subject.por.fl_str_mv |
Clusters Antiferromagnetos Desordem Frustração Vidro de Spin |
topic |
Clusters Antiferromagnetos Desordem Frustração Vidro de Spin Antiferromagnets Disorder Frustration Spin Glass CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
dc.subject.eng.fl_str_mv |
Antiferromagnets Disorder Frustration Spin Glass |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
description |
In magnetic systems, frustration - which refers to the inhability to satisfy all the interactios simultaneously - has ravealed a rich phenomenology. In particular, disorder and geometrical features are possible sources of frustration. Systems that combine these two sources generally give rise to a number of challenging problems. In the present work, we approach the interplay between geometrical frustration (GF) and bond disorder, focusing in the rich phenomenology underlying the cluster spin glass (CSG) phase stabilization. In order to deal with this problem we considered the van Hemmen and the Sherrington-Kirkpatrick cluster models, as well as cluster mean-field methods. Our studies focused on the J1-J2 square, the antiferromagnetic kagome and the checkerboard Ising lattices with intercluster disorder. In the square and kagome lattices, we studied the CSG onset at low levels of disorder in geometrically frustrated systems, which is a problem with great experimental motivation. Our results indicate that the increase in frustration (by tuning J2=J1) reduces the minimum amount of disorder needed to stabilize the CSG in the square lattice. Moreover, for the kagome lattice, we found that an infinitesimal disorder leads to a CSG ground-state. This result can be compared to the experimental findings for the Co3Mg(OH)6Cl2 compound, that is pointed out as an experimental realization of the Ising kagome antiferromagnet. Moreover, we investigate the effects of GF on the onset of reentrant transitions. In this study, we considered a model with disorder between clusters in the presence of an external longitudinal magnetic field. Our results indicate that cluster magnets are prototypes for the observation of inverse freezing. Besides, at weak disorders, we observed the onset of field-induced CSG phases, indicating that cluster antiferromagnets are also candidates for field-induced glassy phases. |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-05-09T14:44:34Z |
dc.date.available.fl_str_mv |
2019-05-09T14:44:34Z |
dc.date.issued.fl_str_mv |
2019-01-11 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/16501 |
url |
http://repositorio.ufsm.br/handle/1/16501 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.cnpq.fl_str_mv |
100500000006 |
dc.relation.confidence.fl_str_mv |
600 |
dc.relation.authority.fl_str_mv |
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dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Ciências Naturais e Exatas |
dc.publisher.program.fl_str_mv |
Programa de Pós-Graduação em Física |
dc.publisher.initials.fl_str_mv |
UFSM |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Física |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Ciências Naturais e Exatas |
dc.source.none.fl_str_mv |
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